Tried only on the TMO variant, others feel free if you want.. Enter the numbers/symbols combo below (in red) into your phones dial pad, like you're making a phone call or you can just copy/paste it there too. No idea what most of the options are or what they do, so if you're not sure either, it's best to just look but don't touch or maybe not even look at all.
Code:
277634#*#
Code:
277634#*#
